Platen electrical signal detection equipment

Abstract

The present application relates to a pressure plate electrical signal detection device, including: a sampling device for differentially collecting and analog-to-digital conversion of the voltage pulse of the pressure plate at the outlet of the protection device, obtaining a digital signal and sending it to a processing device; a processing device for obtaining the potential value of the pressure plate according to the digital signal and sending it to an output device; and the output device for displaying the potential value of the pressure plate. The sampling device is used to differentially collect and analog-to-digital conversion of the voltage pulse of the pressure plate at the outlet of the protection device, and the processing device is used to analyze the converted digital signal to obtain the pressure plate potential value and send it to the output device for display. It can collect the instantaneous potential change of the pressure plate at the outlet of the protection device and display the result status, which solves the problem of requiring two people on site to cooperate to complete the measurement of the increase in the amount of the protection device and the potential change of the outlet pressure plate, and enables the staff to complete the inspection of the potential change of the outlet pressure plate alone, effectively reducing manpower loss and improving work efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of electric power grid, and in particular to a pressure plate electrical signal detection device. Background Art

[0002] When a primary device in the power system fails, the protection device uses the collected analog and switch quantities, and the protection algorithm to identify the type of primary device fault, and drives the output relay to close or disconnect the contacts in the secondary circuit according to the inherent logic, thereby conducting the operating circuit of the faulty primary device and tripping the switch of the faulty primary device to isolate the fault from the system. The potential change of the output pressure plate of the protection device is the basis for identifying whether the protection device has tripped at the output, and it is also a must-check item during the acceptance and regular inspection of the protection device. Since the potential change of the output pressure plate is an instantaneous signal, two people are often required on site to work together to complete the measurement of the protection device addition and the output pressure plate potential change, and there is a lack of effective equipment to improve work efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a pressure plate electrical signal detection device that can improve work efficiency in order to address the above problems.

[0004] A platen electrical signal detection device, comprising:

[0005] A sampling device for differentially collecting and analog-to-digital converting the voltage pulse of the outlet pressure plate of the protection device to obtain a digital signal and send it to the processing device;

[0006] The processing device obtains the potential value of the pressure plate according to the digital signal and sends it to the output device;

[0007] The output device displays the potential value of the pressure plate; wherein the processing device is connected to the sampling device and the output device, and the sampling device is used to connect the outlet pressure plate of the protection device.

[0008] In one embodiment, the sampling device includes a differential acquisition circuit and an analog-to-digital conversion circuit, the differential acquisition circuit is used to connect to the outlet pressure plate of the protection device, and the analog-to-digital conversion circuit connects the differential acquisition circuit and the processing device.

[0009] In one embodiment, the differential acquisition circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a diode D0, a switch diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C11, a capacitor C12 and an operational amplifier U2;

[0010] The resistor R1 and the resistor R3 are connected in series, and the common end is connected to one end of the resistor R2 and one end of the capacitor C1, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is connected to the protection device outlet pressure plate, the other end of the resistor R3 is connected to the in-phase input end of the operational amplifier U2, and is grounded through the switching diode D2; one end of the resistor R4 is connected to the inverting input end of the operational amplifier U2, the other end of the resistor R4 is grounded, the power supply end of the operational amplifier U2 is connected to the power supply access end, and the grounding end of the operational amplifier U2 is grounded;

[0011] One end of the resistor R6 is connected to the power supply access terminal, the other end of the resistor R6 is connected to one end of the capacitor C11, one end of the resistor R5 and the anode of the diode D0, the other end of the capacitor C11 is grounded, the cathode of the diode D0 is grounded, the other end of the resistor R5 is connected to the non-inverting input terminal of the operational amplifier U2, and is grounded through the capacitor C2; after the resistor R7 and the capacitor C4 are connected in parallel, one end is connected to the output terminal of the operational amplifier U2, and the other end is connected to the inverting input terminal of the operational amplifier U2, one end of the capacitor C3 is connected to the inverting input terminal of the operational amplifier U2, the other end of the capacitor C3 is grounded, the output terminal of the operational amplifier U2 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the anode of the diode D3, one end of the capacitor C5 and the analog-to-digital conversion circuit, the cathode of the diode D3 is connected to the power supply access terminal, and the other end of the capacitor C5 is grounded; one end of the capacitor C12 is connected to the power supply access terminal, and the other end of the capacitor C12 is grounded.

[0012] In one embodiment, the analog-to-digital conversion circuit includes a voltage regulator U6, an analog-to-digital converter U7, a resistor R9, a resistor R10, a capacitor C7 and an interface J3, one end of the resistor R9 is connected to a power access terminal, the other end of the resistor R9 is connected to the voltage regulator U6 and the analog-to-digital converter U7, and is grounded through the capacitor C7; the analog-to-digital converter U7 is connected to the differential acquisition circuit and the processing device; the interface J3 is connected to the processing device, and is connected to the power access terminal through the resistor R10.

[0013] In one embodiment, the processing device includes a processing chip U3 and a reset circuit, and the processing chip U3 is connected to the analog-to-digital conversion circuit, the reset circuit and the output device; the processing chip U3 is used to receive the digital signal sent by the analog-to-digital conversion circuit, obtain the pressure plate potential value according to the digital signal and send it to the output device for display, and the processing chip U3 is also used to perform self-check after receiving the reset signal sent by the reset circuit, and control the output device to output alarm information when an abnormality is found in the self-check.

[0014] In one embodiment, the output device includes a display circuit and an alarm circuit, the display circuit is connected to the processing chip U3, and the alarm circuit is connected to the processing chip U3.

[0015] In one embodiment, the display circuit includes a liquid crystal module U4 and a display driving circuit, the display driving circuit is connected to the liquid crystal module U4 and the processing chip U3, and the liquid crystal module U4 is connected to the processing chip U3.

[0016] In one embodiment, the alarm circuit includes a sound alarm circuit and a light display circuit, and both the sound alarm circuit and the light display circuit are connected to the processing chip U3.

[0017] In one of the embodiments, the device further comprises a power supply device, wherein the power supply device is connected to the sampling device, the processing device and the output device.

[0018] In one embodiment, the power supply device includes an interface J1, a diode D1, a switch S1, a capacitor C9, a capacitor C10 and a power chip U1, the anode of the diode D1 is connected to the interface J1, the cathode of the diode D1 is connected to the input end of the power chip U1 through the switch S1, the output end of the power chip U1 is connected to the sampling device, the processing device and the output device, and the ground end of the power chip U1 is grounded; one end of the capacitor C9 is connected to the input end of the power chip U1, the other end of the capacitor C9 is grounded, one end of the capacitor C10 is connected to the output end of the power chip U1, and the other end of the capacitor C10 is grounded.

[0019] The above-mentioned pressure plate electrical signal detection equipment uses a sampling device to perform differential acquisition and analog-to-digital conversion on the voltage pulse of the outlet pressure plate of the protection device, and uses a processing device to analyze the converted digital signal to obtain the pressure plate potential value and send it to the output device for display. It can collect the instantaneous potential change of the outlet pressure plate of the protection device and display the result status, which solves the problem that two people are required to cooperate on site to complete the measurement of the protection device addition and the outlet pressure plate potential change, and enables the staff to complete the outlet pressure plate potential change inspection alone, effectively reducing manpower loss and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural block diagram of a pressure plate electrical signal detection device in one embodiment;

[0021] Figure 2 It is a structural block diagram of a pressure plate electrical signal detection device in another embodiment;

[0022] Figure 3This is a structural schematic diagram of a power supply device in one embodiment;

[0023] Figure 4 is a structural block diagram of a sampling device in an embodiment;

[0024] Figure 5 is a structural principle diagram of a differential acquisition circuit in one embodiment;

[0025] Figure 6 A schematic diagram of the structure of an analog-to-digital conversion circuit in an embodiment;

[0026] Figure 7 is a structural principle diagram of a processing device in one embodiment;

[0027] Figure 8 is a structural block diagram of an output device in an embodiment;

[0028] Fig. 9 It is a structural principle diagram of a display circuit and a sound alarm circuit in one embodiment;

[0029] Fig.10 4 is a structural principle diagram of a light-emitting display circuit in an embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] In one embodiment, a pressure plate electrical signal detection device is provided, such as Figure 1 As shown, it includes a sampling device 200, a processing device 300 and an output device 400. The processing device 300 is connected to the sampling device 200 and the output device 400, and the sampling device 200 is used to connect the outlet pressure plate of the protection device.

[0032] The sampling device 200 performs differential acquisition and analog-to-digital conversion on the voltage pulse of the pressure plate at the outlet of the protection device, obtains a digital signal and sends it to the processing device 300; the processing device 300 obtains the pressure plate potential value according to the digital signal and sends it to the output device 400; the output device displays the pressure plate potential value.

[0033] The voltage pulse of the outlet pressure plate of the protection device is differentially collected and converted into analog-to-digital by the sampling device 200, and the plate potential value is obtained by analyzing the converted digital signal by the processing device 300 and sent to the output device 400 for display. The instantaneous potential change of the outlet pressure plate of the protection device can be collected and the display result state can be maintained, which solves the problem that two people are required to cooperate on site to complete the measurement of the increase of the protection device and the potential change of the outlet pressure plate, and enables the staff to complete the inspection of the potential change of the outlet pressure plate alone.

[0034] Further, in one embodiment, if Figure 2 As shown, the device further includes a power supply device 100, which is connected to the sampling device 200, the processing device 300 and the output device 400. The sampling device 200, the processing device 300 and the output device 400 are powered by the power supply device 100 to ensure stable and reliable operation of the device.

[0035] The specific structure of the power supply device 100 is not unique. In one embodiment, Figure 3 As shown, the power supply device 100 includes an interface J1, a diode D1, a switch S1, a capacitor C9, a capacitor C10 and a power chip U1, the anode of the diode D1 is connected to the interface J1, the cathode of the diode D1 is connected to the input terminal VIN of the power chip U1 through the switch S1, the output terminal VOUT of the power chip U1 is connected to the sampling device 200, the processing device 300 and the output device 400, and the ground terminal GND of the power chip U1 is grounded; one end of the capacitor C9 is connected to the input terminal VIN of the power chip U1, the other end of the capacitor C9 is grounded, one end of the capacitor C10 is connected to the output terminal VOUT of the power chip U1, and the other end of the capacitor C10 is grounded.

[0036] Specifically, the power chip U1 can be HT5331, the switch S1 can be SW SPST single-pole single-position switch, and the diode D1 can be S4 diode. The external voltage VCC is connected through the interface J1 and transmitted to the input terminal VIN of the power chip U1 through the diode D1 and the switch S1. The power chip U1 processes the connected voltage and outputs a +3.3V voltage to the power access terminal to power other devices of the equipment.

[0037] In one embodiment, Figure 4 As shown, the sampling device 200 includes a differential acquisition circuit 220 and an analog-to-digital conversion circuit 240. The differential acquisition circuit 220 is used to connect the protection device outlet pressure plate, and the analog-to-digital conversion circuit 240 connects the differential acquisition circuit 220 and the processing device 300. The differential acquisition circuit 220 is used to differentially acquire the input voltage pulse, then step down the voltage, and follow the change of the input voltage pulse, and then amplify the signal to the voltage level required for processing by the analog-to-digital conversion circuit 240. The analog-to-digital conversion circuit 240 performs analog-to-digital conversion on the voltage pulse output by the differential acquisition circuit 220 of the previous stage, and then sends the converted digital quantity to the processing device 300.

[0038] The specific structures of the differential acquisition circuit 220 and the analog-to-digital conversion circuit 240 are not unique. In one embodiment, Figure 5As shown, the differential acquisition circuit 220 includes resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, diode D0, switch diode D2, diode D3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C11, capacitor C12 and operational amplifier U2.

[0039] The resistor R1 and the resistor R3 are connected in series, and the common end is connected to one end of the resistor R2 and one end of the capacitor C1, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is connected to the protection device outlet pressure plate, the other end of the resistor R3 is connected to the non-inverting input end of the operational amplifier U2, and is grounded through the switch diode D2. One end of the resistor R4 is connected to the inverting input end of the operational amplifier U2, the other end of the resistor R4 is grounded, the power supply end of the operational amplifier U2 is connected to the power access end, and the ground end of the operational amplifier U2 is grounded. One end of the resistor R6 is connected to the power access end, the other end of the resistor R6 is connected to one end of the capacitor C11, one end of the resistor R5 and the anode of the diode D0, the other end of the capacitor C11 is grounded, the cathode of the diode D0 is grounded, and the other end of the resistor R5 is connected to the non-inverting input end of the operational amplifier U2, and is grounded through the capacitor C2. After the resistor R7 and the capacitor C4 are connected in parallel, one end is connected to the output end of the operational amplifier U2, and the other end is connected to the inverting input end of the operational amplifier U2. One end of the capacitor C3 is connected to the inverting input end of the operational amplifier U2, and the other end of the capacitor C3 is grounded. The output end of the operational amplifier U2 is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the anode of the diode D3, one end of the capacitor C5 and the analog-to-digital conversion circuit 240. The cathode of the diode D3 is connected to the power supply access end, and the other end of the capacitor C5 is grounded; one end of the capacitor C12 is connected to the power supply access end, and the other end of the capacitor C12 is grounded.

[0040] The power supply access terminal is used to access the +3.3V voltage output by the power supply device 100. The resistor R1 can be connected to the protection device outlet pressure plate through the interface J2. The operational amplifier U2 can specifically use the LM2904 dual operational amplifier chip. The LM2904 chip includes an operational amplifier U2A and an operational amplifier U2B. In this embodiment, the corresponding pins of the operational amplifier U2B are connected to the components in the differential acquisition circuit 220 for signal processing. The diode D0 and the diode D3 are both S4 diodes, and the switch diode D2 can use the BAV99 switch diode.

[0041] In one embodiment, Figure 6As shown, the analog-to-digital conversion circuit 240 includes a voltage regulator U6, an analog-to-digital converter U7, a resistor R9, a resistor R10, a capacitor C7 and an interface J3, one end of the resistor R9 is connected to the power access terminal, the other end of the resistor R9 is connected to the voltage regulator U6 and the analog-to-digital converter U7, and is grounded through the capacitor C7; the analog-to-digital converter U7 is connected to the differential acquisition circuit 220 and the processing device 300; the interface J3 is connected to the processing device 300, and is connected to the power access terminal through the resistor R10.

[0042] Specifically, the voltage regulator U6 may use an LM285-2.5 chip, and the analog-to-digital converter U7 may use a CS1237 chip. Pin vd of the voltage regulator U6 is connected to pin REFIN of the analog-to-digital converter U7, and the common end of the resistor R9 and the capacitor C7, and pin gnd of the voltage regulator U6 is grounded. Pin SCLK and pin DOUT of the analog-to-digital converter U7 are connected to the processing device 300, pin AIN+ of the analog-to-digital converter U7 is connected to resistor R8 in the differential acquisition circuit 220, and pin AIN- and pin GND of the analog-to-digital converter U7 are grounded.

[0043] In one embodiment, Figure 7 As shown, the processing device 300 includes a processing chip U3 and a reset circuit, and the processing chip U3 is connected to the analog-to-digital conversion circuit 240, the reset circuit and the output device 400; the processing chip U3 is used to receive the digital signal sent by the analog-to-digital conversion circuit 240, obtain the pressure plate potential value according to the digital signal and send it to the output device 400 for display, and the processing chip U3 is also used to perform self-inspection after receiving the reset signal sent by the reset circuit, and control the output device to output an alarm message when an abnormality is found in the self-inspection.

[0044] Specifically, the processing chip U3 may adopt a STC15W4K60S4_LQFP44 chip, and the processing device 300 may further include a resistor R12, a resistor R13, a resistor R14, a capacitor C6, and a capacitor C8. The processing chip U3 is connected to the pin AIN+ of the analog-to-digital converter U7 through the resistor R14. The reset circuit includes a reset button S2 and a resistor R11. One end of the reset button S2 is connected to the processing chip U3 and is connected to the power supply access terminal through the resistor R11. The other end of the reset button S2 is grounded. The reset button S2 may adopt a SW-PB switch.

[0045] In one embodiment, Figure 8 As shown, the output device 400 includes a display circuit 420 and an alarm circuit 440, wherein the display circuit 420 is connected to the processing chip U3, and the alarm circuit 440 is connected to the processing chip U3. The processing chip U3 sends the detected platen potential value to the display circuit 420 for display, and controls the alarm circuit 440 to output alarm information when an abnormality is found in the self-check, so that the operator can know it.

[0046] Further, in one embodiment, if Fig. 9 As shown, the display circuit 420 includes a liquid crystal module U4 and a display driving circuit, the display driving circuit is connected to the liquid crystal module U4 and the processing chip U3, and the liquid crystal module U4 is connected to the processing chip U3. Specifically, the display driving circuit includes a switch tube Q4, a switch tube Q6, a resistor R20, a resistor R21, a resistor R28 and a resistor R32, the pin GND of the liquid crystal module U4 is grounded, the pins DATA, WR and CS are connected to the corresponding pins of the processing chip U3, the pin VDD of the liquid crystal module U4 is connected to the output end of the switch tube Q6, the input end of the switch tube Q6 is connected to the power access end, the common end of the resistor R28 and the resistor R32 is connected in series to the control end of the switch tube Q6, the other end of the resistor R28 is connected to the power access end, and the other end of the resistor R32 is connected to the corresponding pin of the processing chip U3. The pin LED+ of the liquid crystal module U4 is connected to the resistor R12 in the processing device 300 through the resistor R20, and is connected to the corresponding pin of the processing chip U3 through the resistor R12. The pin LED- of the liquid crystal module U4 is connected to the input end of the switch tube Q4, the output end of the switch tube Q4 is grounded, and the control end of the switch tube Q4 is connected to the corresponding pin of the processing chip U3 through the resistor R21. Among them, the switch tube Q4 and the switch tube Q6 can be triodes or MOS tubes. In this embodiment, the switch tube Q4 is a 9014 model triode, and the switch tube Q6 is a 9012 model triode.

[0047] In one embodiment, the alarm circuit 440 includes a sound alarm circuit and a light-emitting display circuit, and both the sound alarm circuit and the light-emitting display circuit are connected to the processing chip U3. Specifically, the processing chip U3 also controls the sound alarm drive circuit and the light-emitting display circuit to output prompt information when the potential value of the pressure plate meets the preset conditions. The specific content of the preset conditions is not unique. In this embodiment, when the processing chip U3 detects that the instantaneous potential of the pressure plate at the outlet of the protection device meets the measured potential greater than 38.5V for a continuous period of 4ms for three consecutive cycles (one cycle is 0.02s, corresponding to the power system 50Hz), the light-emitting display circuit is lit and the light signal is maintained, and the sound alarm circuit is driven to prompt and maintain the prompt signal until the reset button S2 is used to reset the signal.

[0048] The specific structures of the sound alarm circuit and the light-emitting display circuit are not unique. In one embodiment, continue to refer to Fig. 9 The sound alarm circuit 442 includes a buzzer LS1, a switch tube Q3, a resistor R18 and a resistor R19. Port 1 of the buzzer LS1 is connected to the corresponding pin of the processing chip U3 through the resistor R18, port 2 of the buzzer LS1 is connected to the input end of the switch tube Q3, the output end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the corresponding pin of the processing chip U3 through the resistor R19. Among them, the switch tube Q3 can use a 9014 type triode.

[0049] In addition, the output device 400 also includes a switch tube Q5, a resistor R27 and a resistor R33, the input end of the switch tube Q5 is connected to the power access end, the output end of the switch tube Q5 is connected to the pin VDD of the analog-to-digital converter U7, the common end of the resistor R27 and the resistor R33 is connected in series to the control end of the switch tube Q5, the other end of the resistor R27 is connected to the power access end, and the other end of the resistor R33 is connected to the corresponding pin of the processing chip U3. Among them, the switch tube Q3 can use a 9012 model triode. By switching the switch tube Q5 on and off by the processing chip U3, it can control whether the analog-to-digital converter U7 is working.

[0050] In one embodiment, Fig.10 As shown, the light-emitting display circuit includes LED lamps D4 to D8, and resistors R22 to R26, and the light-emitting display circuit also includes a two-color lamp D9, a resistor R30 and a resistor R31. One end of the resistors R22 to R26 is connected to the power supply access terminal, and the other end of the resistors R22 to R26 is respectively connected to the anode of a corresponding LED lamp in the LED lamps D4 to D8, and the cathodes of the LED lamps D4 to D8 are respectively connected to the corresponding pins of the processing chip U3. Pin 1 of the two-color lamp D9 is grounded, and pins 2 and 3 are connected to the corresponding pins of the processing chip U3 through resistors R31 and R30 respectively.

[0051] The above-mentioned pressure plate electrical signal detection equipment can collect the instantaneous potential changes of the outlet pressure plate of the protection device and display the result status, which solves the problem of two people working together on site to complete the measurement of the protection device addition and the outlet pressure plate potential change. It enables the staff to complete the outlet pressure plate potential change inspection alone, effectively reducing manpower loss and improving work efficiency.

[0052] In order to facilitate a better understanding of the above-mentioned pressure plate electrical signal detection device, it is described in detail below in conjunction with specific embodiments.

[0053] The platen electrical signal detection device consists of a power module, a sampling module, a calculation module, and an output module. The power module is powered by a DC 12V battery. After the switch S1 is closed, the circuit can be powered. The input voltage is isolated and converted by the chip U1 and then powered to other modules. The sampling module consists of a differential acquisition module and an analog-to-digital conversion module. The differential acquisition module is located at the front end of the analog-to-digital conversion module. The differential acquisition module is responsible for input voltage pulse detection, and the input voltage pulse is differentially acquired and then stepped down, while following the input voltage pulse changes, and then amplified to the voltage level required for the analog-to-digital conversion module to process. The analog-to-digital conversion module is responsible for A / D conversion of the voltage pulse input by the upper differential acquisition module, and then sending the converted digital quantity to the calculation module. The calculation module is responsible for executing the output module according to the pre-stored program to drive the data input by the sampling module; when the reset button S2 is pressed after the device is powered on, the circuit is self-checked. If the self-check is abnormal, the buzzer is driven to alarm; when the reset button S2 is pressed when the device is running, the state of the input data is re-detected and the program is executed. The output module consists of a buzzer module and a display light module. The buzzer module is responsible for driving the buzzer according to the input command of the calculation module; the display light module is responsible for driving the display light according to the input command of the calculation module.

[0054] The above-mentioned pressure plate electrical signal detection equipment can identify both AC and DC voltages. The electrical identification criterion is that the measured potential is greater than 38.5V for three consecutive cycles for a continuous period of 4ms. Once the criterion is met, the display light will be lit immediately and the light signal will be maintained. At the same time, the buzzer will be driven to prompt and maintain the prompt signal until the reset button is used to reset the signal. It has voltage isolation and power-on self-test functions. After the power switch is closed and the device is powered on, the device can be self-tested by manually pressing the reset button. Once the self-test is abnormal, the display light will be lit to warn. It meets the physical isolation of the input and output of the device to avoid the introduction of external potentials that may cause a device to malfunction.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A platen electrical signal detection device, characterized in that: include: A sampling device for differentially collecting and analog-to-digital converting the voltage pulse of the outlet pressure plate of the protection device to obtain a digital signal and send it to the processing device; The processing device obtains the potential value of the pressure plate according to the digital signal and sends it to the output device; The output device displays the potential value of the pressure plate; wherein the processing device is connected to the sampling device and the output device, and the sampling device is used to connect the outlet pressure plate of the protection device; The sampling device includes a differential acquisition circuit and an analog-to-digital conversion circuit, wherein the differential acquisition circuit is used to connect to the outlet pressure plate of the protection device, and the analog-to-digital conversion circuit connects the differential acquisition circuit and the processing device; The differential acquisition circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a diode D0, a switching diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C11, a capacitor C12 and an operational amplifier U2; The resistor R1 and the resistor R3 are connected in series, and the common end is connected to one end of the resistor R2 and one end of the capacitor C1, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is connected to the protection device outlet pressure plate, the other end of the resistor R3 is connected to the in-phase input end of the operational amplifier U2, and is grounded through the switching diode D2; one end of the resistor R4 is connected to the inverting input end of the operational amplifier U2, the other end of the resistor R4 is grounded, the power supply end of the operational amplifier U2 is connected to the power supply access end, and the grounding end of the operational amplifier U2 is grounded; One end of the resistor R6 is connected to the power supply access terminal, the other end of the resistor R6 is connected to one end of the capacitor C11, one end of the resistor R5 and the anode of the diode D0, the other end of the capacitor C11 is grounded, the cathode of the diode D0 is grounded, the other end of the resistor R5 is connected to the non-inverting input terminal of the operational amplifier U2, and is grounded through the capacitor C2; after the resistor R7 and the capacitor C4 are connected in parallel, one end is connected to the output terminal of the operational amplifier U2, and the other end is connected to the inverting input terminal of the operational amplifier U2, one end of the capacitor C3 is connected to the inverting input terminal of the operational amplifier U2, the other end of the capacitor C3 is grounded, the output terminal of the operational amplifier U2 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the anode of the diode D3, one end of the capacitor C5 and the analog-to-digital conversion circuit, the cathode of the diode D3 is connected to the power supply access terminal, and the other end of the capacitor C5 is grounded; one end of the capacitor C12 is connected to the power supply access terminal, and the other end of the capacitor C12 is grounded.

2. The device according to claim 1, characterized in that The analog-to-digital conversion circuit includes a voltage regulator U6, an analog-to-digital converter U7, a resistor R9, a resistor R10, a capacitor C7 and an interface J3, one end of the resistor R9 is connected to a power access terminal, the other end of the resistor R9 is connected to the voltage regulator U6 and the analog-to-digital converter U7, and is grounded through the capacitor C7; the analog-to-digital converter U7 is connected to the differential acquisition circuit and the processing device; the interface J3 is connected to the processing device, and is connected to the power access terminal through the resistor R10.

3. The device according to claim 1, characterized in that The processing device includes a processing chip U3 and a reset circuit, and the processing chip U3 is connected to the analog-to-digital conversion circuit, the reset circuit and the output device; the processing chip U3 is used to receive the digital signal sent by the analog-to-digital conversion circuit, obtain the pressure plate potential value according to the digital signal and send it to the output device for display, and the processing chip U3 is also used to perform self-inspection after receiving the reset signal sent by the reset circuit, and control the output device to output alarm information when an abnormality is found during the self-inspection.

4. The device according to claim 3, characterized in that The reset circuit includes a reset button S2 and a resistor R11. One end of the reset button S2 is connected to the processing chip U3 and is connected to a power supply access terminal through the resistor R11. The other end of the reset button S2 is grounded.

5. The device according to claim 3, characterized in that The output device includes a display circuit and an alarm circuit. The display circuit is connected to the processing chip U3, and the alarm circuit is connected to the processing chip U3.

6. The device according to claim 5, characterized in that The display circuit includes a liquid crystal module U4 and a display driving circuit. The display driving circuit is connected to the liquid crystal module U4 and the processing chip U3. The liquid crystal module U4 is connected to the processing chip U3.

7. The device according to claim 5, characterized in that The alarm circuit includes a sound alarm circuit and a light display circuit, and both the sound alarm circuit and the light display circuit are connected to the processing chip U3.

8. The device according to claim 7, characterized in that The sound alarm circuit includes a buzzer LS1, a switch tube Q3, a resistor R18 and a resistor R19. Port 1 of the buzzer LS1 is connected to the corresponding pin of the processing chip U3 through the resistor R18, port 2 of the buzzer LS1 is connected to the input end of the switch tube Q3, the output end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the corresponding pin of the processing chip U3 through the resistor R19.

9. The device according to any one of claims 1 to 8, characterized in that: It also includes a power supply device, which is connected to the sampling device, the processing device and the output device.

10. The device according to claim 9, characterized in that The power supply device includes an interface J1, a diode D1, a switch S1, a capacitor C9, a capacitor C10 and a power chip U1, the anode of the diode D1 is connected to the interface J1, the cathode of the diode D1 is connected to the input end of the power chip U1 through the switch S1, the output end of the power chip U1 is connected to the sampling device, the processing device and the output device, and the ground end of the power chip U1 is grounded; one end of the capacitor C9 is connected to the input end of the power chip U1, the other end of the capacitor C9 is grounded, one end of the capacitor C10 is connected to the output end of the power chip U1, and the other end of the capacitor C10 is grounded.

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